Power ESP32 3,3V with B2A20S20P-Heat-CAN

Hi there,


What is the best way to power ESP32 with JK-BMS? There is RS486 port which provides GND, TX, RS + Vbat which unfortunately is about 56V for my 16x Lifepo batteries... I already tried the black wire of the LCD port which provides 4-6V, unfortunately the voltage drops after connecting to the ESP32.


The idea is not to use an external power supply. Unfortunately I do not have a step down converter that can do 60V -> 3.3V at the moment and could potentially be connected to VBat.

I haven't found any easy way to power a ESP32, there are a few options.
Use an ESP32 with an onboard regulator and power it via USB port, most development boards operate in this way, then you can:
Use an external mains power supply/USB charger
Use nearby USB port ( I use a nearby raspberry pi)
Use a USB or +5v from the inverter
Use a buck converter (with a small fuse), there are numerous available on AliExpress(look for 60v) with usb output.

Oh,

I have B2A20S20P-Heat-CAN which do not have any USB Ports. I just want to "steal" some power from any exposed ports to power ESP32...

There is no suitable option from the BMS.
As I said use a ESP32 with a USB PORT and power if from that, it gives you more options being 5V.

Tap off battery 1? Set BMS to cutoff at 3.60v (max voltage of ESP32). Don't know how that will affect cell balance.

DIYrich said:

Tap off battery 1? Set BMS to cutoff at 3.60v (max voltage of ESP32). Don't know how that will affect cell balance.

Click to expand...

When the cells are discharged 2.5V is a bit low.
Using the balance cables would affect the voltage readings of cells.
It would also probably get them out of balance and make more work for the balancer.
Would be better to use a 60v to 5V/3v3 buck converter